JP2533531Y2 - Gear mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gear mechanism used for a driving mechanism of a printer or the like.

[0002]

2. Description of the Related Art At present, a gear mechanism in which a drive motor is combined with a gear train is generally used as a drive mechanism of a movable portion such as a platen roller of a printer.

A conventional example of such a gear mechanism will be described with reference to FIG. First, in the gear mechanism 1, a driven gear 4 is rotatably supported by a support shaft 3 protruding from a front surface of a flat gear frame 2.
A drive gear 5 meshing with the drive motor 6 is mounted on a drive shaft 7 of a drive motor 6. Here, the drive motor 6 is fixed to a rear surface of the gear frame 2 with screws (not shown) as a fixing mechanism or the like, and the drive motor 6 is inserted into a drive shaft hole 8 penetrating the front and rear surfaces of the gear frame 2. The drive shaft 7 of the motor 6 is inserted. Further, in the gear mechanism 1, the support shaft 3 is fixed by caulking after being inserted into a support shaft hole 9 penetrating the front and rear surfaces of the gear frame 2, and an E-ring 10 is attached to a tip end thereof. Thus, the driven gear 4 is rotatably held. Note that such a gear mechanism 1 actually fixes the drive motor 6 to the gear frame 2 with a screw (not shown) or the like, and attaches the gear frame 2 to a main body frame (not shown). (Not shown).

In such a configuration, the gear mechanism 1
Then, the driven gear 4 is rotatably supported by the support shaft 3 protruding near the drive shaft 7 of the drive motor 6, so that the driving force of the drive motor 6 is transmitted from the drive gear 5 via the driven gear 4 to other places. To be communicated to.

[0005]

In the gear mechanism 1 described above, the driving force of the driving motor 6 is transmitted from the driving gear 5 to the driven gear 4.
It can be transmitted to other places via.

In the gear mechanism 1 described above, the support shaft 3 that supports the driven gear 4 is mounted on the gear frame 2 by caulking. Such caulking requires a special tool. Since the operation is complicated, the productivity of the gear mechanism 1 is reduced.

[0007]

A drive for holding a drive gear
A drive motor with a shaft protruding from the main body is provided.
Forms a gear frame that holds the data fixed by a fixing mechanism
The drive shaft is mounted on the gear frame together with the drive gear.
A drive shaft hole is formed to penetrate the gear frame,
Positioned on the shaft center separated from the shaft center of the drive shaft hole by a specified distance
A support shaft hole is formed, and the drive shaft is inserted into the support shaft hole.
A support shaft that holds the driven gear meshing with the gear is provided.
A flange that expands radially on the drive shaft side of the support shaft.
An outer surface of the gear frame and the drive motor
The flange portion of the support shaft is sandwiched between one surface of
I carried it .

[0008]

The fixing of the support shaft to the gear frame can be achieved manually without using a dedicated tool or the like, which can contribute to an improvement in the productivity of the gear mechanism.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. First, the gear mechanism 11 is connected to a platen roller (not shown), for example, as a part of a printer device (not shown).

In the gear mechanism 11, as illustrated in FIG. 1, a pair of opposed gear frames 12, 1 is provided.
3 are integrally formed to form a gear box 14,
The gears 4, 5 are located between the gear frames 12, 13 of the gear box 14. Therefore, in the gear mechanism 11, the driven gear 4 is rotatably supported by a support shaft 15 mounted between the gear frames 12, 13, and the driving gear 5 meshing with the driven gear 4 is connected to the gear frame. It is mounted on the drive shaft 7 of the drive motor 6 that penetrates through the 12 drive shaft holes 16.

Here, in the gear mechanism 11, the drive motor 6 has two triangular flanges 18 integrally protruding from an outer peripheral portion of a front surface of a cylindrical main body 17, as shown in FIG.
And an arc-shaped support portion 19 that rotatably supports the main body 17 of the drive motor 6 as illustrated in FIG.
A holder 20 forming a recess in which the flange 18 of the drive motor 6 is removably engaged;
Are formed integrally on the rear surface. In the gear mechanism 11, as illustrated in FIG. 4, the drive motor 6 is driven by the engagement of the main body 17 and the flange portion 18 with the support portion 19 and the holder portion 20 as described above. By fixing the gear box 14 mounted on the main body frame 21 with screws 22, the flange portion 18 in the holder portion 20 is held on the main body frame 21 and the drive motor 6 is connected to the gear box 14. To be fixed. That is, in the gear mechanism 11, the fixing mechanism 23 for fixing the drive motor 6 to the rear surface of the gear frame 12 includes the flange portion 18, the support portion 19, the holder portion 20, the main body frame 21, the screw 22
And so on.

In the gear mechanism 11, the support shaft 15 is integrally formed with a flange portion 26 at a distal end.
Support shaft holes 2 formed in the gear frames 12 and 13
4 and 25 are sequentially inserted. In the gear mechanism 11, the drive motor 6 is mounted on the gear box 14 as described above with the flange 26 formed at the end of the support shaft 15 abutting against the rear surface of the gear frame 12. The front surface of the drive motor 6 abuts against the flange 26, which is also a stopper, so that the support shaft 15 is fixed between the gear frames 12, 13.

In such a configuration, the gear mechanism 1
In 1, the driven gear 4 is rotatably supported by a support shaft 15 protruding near the drive shaft 7 of the drive motor 6, so that the driving force of the drive motor 6 is transmitted from the drive gear 5 via the driven gear 4. It is to be transmitted to other places.

In this gear mechanism 11, the support shaft 15, which supports the driven gear 4 as described above, is connected to the support shaft holes 24, 25 of the gear frames 12, 13, and the end flange portion 26 is inserted. Is fixed in the gear box 14 by being positioned and held on the front surface of the drive frame 6 on the rear surface of the gear frame 12, and this fixation is realized manually without the need for a dedicated tool or the like. Is good. Moreover, in the gear mechanism 11, the tip of the support shaft 15 protruding from the front surface of the gear frame 12 as described above is inserted into the support shaft hole 25 of the gear frame 13. The position holding is strong, and the driven gear 4 is rotatably held without requiring an E-ring or the like.

Further, in the gear mechanism 11, as described above, the drive motor 6 can be manually mounted on the gear box 14 which is mounted on the main body frame 21 with the screw 22 without using any tools. Very good.
Here, such a mounting process of the drive motor 6 will be described in detail below with reference to FIG. First, as illustrated in FIG. 1A, the flange portion 18 of the drive motor 6 is mounted on the gear frame 12.
The main body 17 of the drive motor 6 is inserted into the support portion 19 of the gear frame 12 so as to be located in the gap between the support portion 19 and the holder portion 20 of the gear frame 12. Into the holder portion 20. Then, as illustrated in FIG. 2B, the gear box 14 on which the drive motor 6 is detachably mounted is fixed to the main body frame 21 with screws 22 so that the holder 2
The drive motor 6 is fixed to the gear box 14 while the flange portion 18 in the position 0 is held on the main body frame 21. By doing so, in the gear mechanism 11, the drive motor 6 can be mounted on the gear box 14 very easily.

In the gear mechanism 11 of the present embodiment, the tip of the support shaft 15 protruding from the gear frame 12 is illustrated as being held by the gear frame 13. However, the present invention is not limited to the above structure. Instead, for example, it is also possible to form a large-diameter disk-shaped flange portion 26 at the end of the support shaft 15 and omit the gear frame 13. Further, the front in the present invention means the direction in which the drive shaft 7 protrudes from the drive motor 6, and does not limit the actual use direction of the device or the arrangement direction of various parts.

[0017]

[Effect of the Invention] The present invention holds the drive gear as described above.
A drive motor with the drive shaft
Gear frame that holds and holds the drive motor of the
A gear is formed on the gear frame together with the drive gear.
Forming a drive shaft hole passing through the drive shaft,
The drive shaft hole at a predetermined distance from the axis of the drive shaft hole.
To form a support shaft hole, and inserted into this support shaft hole
A support shaft for holding a driven gear meshing with the drive gear is provided.
And the support shaft is radially expanded toward the drive motor.
A flange portion is formed, and the outer surface of the gear frame and the drive
The flank of the support shaft between one face of the main body of the dynamic motor;
By clamping the flange, the support shaft can be fixed to the gear frame by hand without the need for special tools, which contributes to the improvement of the productivity of the gear mechanism. It has.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is an exploded perspective view observed from behind.

FIG. 3 is a plan view showing a gear box.

FIG. 4 is a rear view showing a process of mounting the drive motor on the gearbox.

FIG. 5 is an exploded perspective view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 4 driven gear 5 drive gear 6 drive motor 7 drive shaft 11 gear mechanism 12 gear frame 15 support shaft 16 drive shaft hole 23 fixing mechanism 24 support shaft hole 26 flange and stopper

Claims (1)

(57) [Scope of request for utility model registration] A drive shaft holding a drive gear projects from a main body.
A drive motor is provided, and this drive motor is
To form a gear frame that is fixed and held.
Drive through the drive shaft with the drive gear into the frame
A shaft hole is formed, and an axis of the drive shaft hole is formed in the gear frame.
A support shaft hole is formed by positioning it on the shaft center that is separated by a predetermined distance from the shaft.
And is inserted into the support shaft hole and meshes with the drive gear.
A support shaft for holding the driven gear is provided, and the drive shaft of the support shaft is provided.
A radially expanding flange is formed on the dynamic motor side.
The outer surface of the gear frame and one surface of the main body of the drive motor.
A gear mechanism characterized in that the flange portion of the support shaft is sandwiched between the two.